JPH0692123B2 - Inversion lining method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reverse lining construction method applicable to sewers, waterworks, oil pipes and any other existing pipes, and more particularly to improvement of adhesion of synthetic resin to existing pipes. .

[Prior art] In recent years, for the purpose of reinforcing the strength of existing pipes such as sewers and waterworks, anticorrosion measures, water leakage and water infiltration measures, and improving the flow rate, synthetic resin is lined on the inner surface of the existing pipe or synthetic resin is applied on the inner surface of the existing pipe The inversion lining method for forming ridges is in the spotlight.

For example, in the method disclosed in Japanese Examined Patent Publication (Kokoku) No. 55-43890 and Japanese Laid-Open Patent Publication No. 64-85738, a needle felt layer is lined with an inner lining material impregnated with a liquid thermosetting resin such as epoxy or polyester under fluid pressure in an existing pipe. To reverse and advance, and press the reversed lining material to the inside surface of the existing pipe by fluid pressure,
This is a method of curing a thermosetting resin and lining a synthetic resin on the inner surface of an existing pipe.

Further, the construction methods disclosed in JP-A-64-16633, JP-A-64-16634 and JP-A-63-285395 are
This is a method in which a small-diameter thermoplastic plastic pipe is inserted into an existing pipe, and then the thermoplastic plastic pipe is heated and pressurized from the inside to be expanded and brought into close contact with the inner surface of the existing pipe.

[Problems to be Solved by the Invention] The lining material used in the conventional reversal method represented by JP-B-55-43890 is a liquid thermosetting resin impregnated in the needle felt layer, which is a reversal surface when reversing in an existing pipe. It moves in the felt layer by a non-uniform pressing force in the circular direction. Therefore, a difference occurs in the resin impregnation amount in the cross-sectional direction of the felt layer,
In addition to variations in thickness, there is a disadvantage that variations in strength occur.

Further, particularly when a long lining material is used, it is necessary to wind or fold it after the impregnation process in order to store the soft lining material impregnated with the liquid resin. At this time, the thickness of each part of the lining material varies due to the difference in its own weight or the pressing force, and the difference in the environmental pressure is applied to the liquid resin. Variations in strength occur.

Further, it is very difficult to uniformly impregnate the liquid resin over the entire length of the flexible bag, and a variation of ± 15% usually occurs, and it is difficult to form a uniform synthetic resin tube.

If the existing pipe has gaps such as displacement, loss, and cracks in the joint portion of the technique pipe, the liquid resin around these gaps oozes into the gap due to the pressing force of the existing pipe after reversing, and In addition to the decrease in strength, the liquid resin also flows out together with the underground infiltration water due to the decrease in clay before gelling due to heating, resulting in a porous impregnated layer and a significant decrease in strength.

Further, the lining material impregnated with the thermosetting resin is inverted and then heat-cured to be molded, and the total time of heating time and cooling time at the time of heat-curing is, for example, 300 mm in diameter, 6 mm in thickness and polyester It takes about 15 hours when using resin. Further, the epoxy resin quick-drying type has a disadvantage that it takes about 6 to 8 hours and the working time becomes long. This is stored in existing pipes and surrounding soil during a long heating and holding period,
This is also due to the slow cooling rate.

Further, when the thermosetting resin is heat-cured, shrinkage occurs in the longitudinal direction and the circumferential direction of the lining layer. Due to this shrinkage, a gap is created between the existing pipe and the lining layer, which also has a disadvantage that it may cause intrusion water or water leakage.

Further, as in the method disclosed in JP-A-64-16633, JP-A-64-16634, or JP-A-63-285395, a thermoplastic resin processed into a smaller cross-sectional shape than the existing pipe diameter. In order to heat, soften, and expand the pipe, there is a large difference in elongation under the same pressure due to the difference in resin temperature, and when heated, it becomes an amorphous state and there is no self-expansion force, so it is necessary to forcibly expand and expand with external pressure. For this reason, it is necessary to uniformly heat the existing pipe and the resin pipe in the circumferential direction and the longitudinal direction under the same pressure. However, in reality, there are disadvantages that the heating temperature varies, wrinkles are generated in the resin pipe, the pipe thickness varies, and a gap is generated between the heating pipe and the existing pipe.

Further, as disclosed in JP-A-63-285395, when a pipe softened on the outer surface of a curved pipe is forcibly stretched and crimped with a pig from a small diameter, there is no shrinkage in the softened state, so the outer surface is covered with other parts. Compared with the thinner pipe, there was a disadvantage that the stretched portion inside had wrinkles on the downstream side in the traveling direction.

The present invention has been made to solve such disadvantages, and an object of the present invention is to propose a reverse lining method capable of reliably adhering a synthetic resin pipe to an inner surface of an existing pipe without using an adhesive or the like. It is a thing.

[Means for Solving the Problem] The inversion lining method according to the present invention is a heat-resistant film tube having a resin pipe and a resin pipe inserted therein, the resin pipe being formed of a shape memory resin and having a changed shape so as to have a small cross-sectional area. The inner lining material is used, and the inner lining material is stored in a pressurizing / heating container, and the pressurizing fluid having a pressure higher than a certain pressure is supplied to the pressurizing / heating container while the pressurizing fluid is shaped into a resin pipe. The lining material is softened by heating at a temperature above the recovery temperature and below the shape memory temperature, and the lining material is supplied while supplying the heated pressurized fluid to the heat retaining hose attached to the lining material supply port of the pressure / heating container. Through the heat-retaining hose, invert the lining material so that the heat-resistant film tube of the lining material is on the inside of the fixing part provided at the tip of the heat-retaining hose, and then pressurize it. It is characterized in that the fluid is continuously supplied to advance the reversal portion of the lining material into the existing pipe.

[Operation] In the present invention, as the lining material, a lining material composed of a resin pipe formed of a shape memory resin and having a changed shape so as to have a small cross-sectional area and a heat-resistant film tube into which the resin pipe is inserted are used. While the material is softened by holding a certain shape with a pressurized fluid heated to a predetermined temperature in a pressurized / heating container, the softened lining material is inverted / progressed into the existing pipe by the pressure of the pressurized fluid. The resin pipe of this inverted lining material is restored to its original shape by the pressure and temperature of the pressurized fluid, and the resin pipe is brought into close contact with the existing pipe.

In addition, since the resin pipe whose shape has been changed to reduce the cross-sectional area is covered by the heat-resistant film tube, the softened resin pipe is deformed by the pressure of the pressurized fluid when the lining material is inverted and advanced in the existing pipe. Prevent that.

[Embodiment] FIG. 1 is a block diagram showing the outline of an inversion lining device used in an embodiment of the present invention. In the figure, 1 is a pressure / heating container, 2 is a lining material supply port of the pressure / heating container 1,
3 is a heat retaining hose attached to the supply port 2, 4 is a fixing portion attached to the tip of the heat retaining hose 3, and 5 is a heat retaining hose 3
A drain valve 6 is provided in the lower portion of the heating boiler 6, and a heating boiler 6 supplies pressurized water of a constant pressure and a constant temperature to the pressure / heating container 1.

The lining material 7 is housed in the pressure / heating container 1 configured as described above. The lining material 7 is made of a shape memory resin and is composed of a resin pipe whose shape is changed so that the cross-sectional area is small and a heat-resistant film tube into which the resin pipe is inserted.

In describing the reverse lining method of this embodiment,
First, the lining material 7 used in this embodiment will be described with reference to the process diagram of FIG. 2 showing the processing steps of the lining material 7.

In FIG. 2, 8 is a resin pipe, and the resin pipe 8
Is a shape memory resin, for example, a block copolymer of polystyrene and crystallized polybutadiene (manufactured by Asahi Kasei Kogyo), trans polyisoprene (manufactured by Kuraray) or polyurethane resin (manufactured by Mitsubishi Heavy Industries). This resin pipe 8 is the second
As shown in FIG. (A), a shape memory resin is extruded into a pipe shape in a heating atmosphere having a shape memory temperature of, for example, 120 ° C. or more, and has an outer diameter of 100 to 150% of the inner diameter of the existing pipe. Remember the shape.

Next, while the resin pipe 8 is softened in a heating atmosphere having a shape recovery temperature (rubberization temperature) of 90 ° C. or higher to a shape memory temperature or lower, a cross-sectional area of the existing pipe is formed by a mechanical method such as a molding roller or an extrusion slit. Flattened so that it becomes smaller than the cross-sectional area of, and bent, etc., as shown in Figs. 2 (b), (c),
The processed pipes 8a, 8b or 8c as shown in (d) are formed. After forming the processed pipes 8a, 8b, 8c, the load heat distortion temperature is immediately higher than the shape memory temperature of the shape memory resin while maintaining the softened state, for example, the load heat distortion temperature is 160 ° C (4.6 ° C).
Films or polyester of kgf / cm ²⁾ nylon or 135 ° C. of (4.6 kgf / cm ^2), to the film tube 9 formed of a film containing the reinforcing fibers which, as shown in FIG. 2 (e) Processing pipe 8a or processing pipe 8
Insert b and 8c to form the lining material 7. This lining material 7
2 is formed in a circular shape as shown in FIG. 2 (f) or is folded as shown in FIG. 2 (g), and then cooled to a shape recovery temperature or lower, and the lining material 7 is formed in a circular shape or in a folded state.
To store.

Next, the operation of this embodiment in which a synthetic resin pipe is formed on the inner surface of an existing pipe using the lining material 7 thus formed will be described.

First, the lining material 7 formed in a circularly wound or folded state is stored in the pressure / heating container 1.

Next, from the heating boiler 6 to the pressure / heating container 1, the lining material 7
The pressurized water having a temperature of not less than the shape recovery temperature of the resin pipe 8 and not more than the shape memory temperature is continuously supplied to keep the resin pipe 8 in the softened state. At this time, the pressurized water is pressurized to a predetermined pressure, for example, 0.1 Kg / cm ² or more so that the resin vapor 8 heated to the shape recovery temperature or higher does not recover the shape to the original shape. In order to suppress the shape recovery of the softened resin pipe 8 as described above, it is preferable that the lining material 7 is formed into a circular winding.

While supplying the pressurized water continuously supplied to the pressurizing / heating container 1 with the heat insulating hose 3 from the pressurizing / heating container 1 and discharging it from the drain valve 5, the tip of the lining material 7 having the resin pipe 8 in a softened state is When the free end is drawn out from the heat retaining hose 3 and is not restricted by the pressure water, the resin pipe 8 recovers its shape and becomes a softened pipe shape as shown in FIG. In this softened state, the resin pipe 8 and the film tube 9 are folded back so that the film tube 9 is quickly inward, and the resin pipe 8 and the film tube 9 are fixed to the fixing portion 4 with the band 10 as shown in FIG. Fix it.

After that, the reversing portion 11 of the lining material 7 is brought close to the pipe opening of the existing pipe 12, the drain valve 5 is closed, and pressurized water of a predetermined pressure and a predetermined temperature is continuously supplied to the heat insulating hose 3 from the heating boiler 6 through the pressurizing / heating container 1. Supply. Due to the pressure of the pressurized water, the reversal portion 11 of the lining material 7 advances in the existing pipe 12 as shown in FIG. When the lining material 7 inverts and advances in the existing pipe 12, the outer surface of the resin pipe 8 of the lining material 7 which is softened above the shape recovery temperature contacts the inner surface of the existing pipe 12, and the inner surface of the resin pipe 8 has a film. The pressure and temperature of the pressurized water act via the tube 9. Therefore, the resin pipe 8 is restored to the original shape and returns to the pipe-like shape. Since the original outer diameter of the resin pipe 8 is 100% to 150% of the inner diameter of the existing pipe 12,
The interaction between the recovery force for recovering the outer diameter and the pressure of the pressurized water works to bring the resin pipe 8 into complete contact with the inner surface of the existing pipe 12 without an adhesive.

In this way, after the resin pipe 8 is brought into close contact with the entire inner surface of the existing pipe 12, cooling water is supplied instead of pressurized water to cool the resin pipe 8 to form a synthetic resin pipe in the existing pipe 12.
After that, post-treatment such as cutting both ends of the formed synthetic resin pipe is performed, and the film tube 9 is recovered and the treatment is completed.

When forming this synthetic resin tube, the film tube 9
Is softened by the pressure of pressurized water
The pressure acts directly on the resin pipe 8
The film tube 9 is prevented from being reversed prior to the film tube 9.

In the above embodiment, the resin pipe 8 is replaced by the film tube 9
In the case of a short-distance, small-diameter tube, the same operation as in the above embodiment can be achieved without covering with the film tube 9.

Further, in the above-described embodiment, the case where the resin pipe 8 is kept at a temperature not lower than the shape recovery temperature and not higher than the shape memory temperature with heated water has been described. Can be played.

[Effects of the Invention] As described above, the present invention is used as a lining material, which is made of a shape memory resin and has a shape changed so as to have a small cross-sectional area, and a heat-resistant film tube into which the resin pipe is inserted. Using this, while softening this lining material while maintaining a certain shape with pressurized water heated to a predetermined temperature in a pressure / heating container, the softened lining material is inverted / progressed in the existing pipe by the pressure of the pressurized water. Since the synthetic resin pipe is formed by recovering the resin pipe of the reversed lining material to the original shape by the pressure and temperature of the pressurized water, the synthetic resin pipe is completely adhered to the existing pipe without adhesive or liquid resin. Therefore, it is possible to prevent the occurrence of water intrusion and water leakage.

In addition, since the plastic pipe is molded into an accurate pipe thickness and then flattened and stored and transported in the solid state, variations in thickness and strength during storage are eliminated, and a rubber-like area (memory recovery Since the temperature is reversed from the temperature to the shape memory temperature, the original thickness is restored immediately after the reversal, the uniform tube thickness and the uniform strength are achieved, and the quality can be remarkably improved.

In addition, since the rubber-like region at the time of reversal also has elasticity, the outer side stretches and adheres to the curved pipe portion, and the inner side contracts along the existing pipe inner wall, so wrinkles can be reduced.

In addition, since a synthetic resin pipe can be formed inside an existing pipe without using an adhesive, it does not require curing time or cooling time for an adhesive, etc. It can be greatly shortened.

Furthermore, since no attachment device such as an adhesive is required, the connecting portion with the existing pipe can be small, and the construction can be performed even from the manhole of the sewer pipe, and the construction cost can be reduced.

In addition, since the softened lining material is inverted / progressed into the existing pipe by the pressure of pressurized water and then the shape is recovered to form the synthetic resin pipe, it is easy to form the synthetic resin pipe that matches the shape in the bent pipe. You can

Also, since the lining material is turned over and advanced in the existing pipe with the resin pipe whose shape has been changed to reduce the cross-sectional area covered with the heat-resistant film tube, the softened resin pipe is prevented from being deformed by the pressure of the pressurized water. Therefore, it is possible to form a perfect cylindrical synthetic resin tube with a small cross-section loss.

[Brief description of drawings]

FIG. 1 is a block diagram showing a reversing lining device used in an embodiment of the present invention, FIG. 2 is a process diagram showing a processing step of a lining material used in the above embodiment, and FIGS. It is sectional drawing which shows the construction process of an Example. 1 ... Pressurization / heating container, 2 ... Liner supply port, 3 ...
Heat insulation hose, 4 fixed part, 5 drain valve, 6 heating boiler, 7 liner, 8 resin pipe, 9
Film tube, 11 …… Inversion part, 12 …… Existing tube.

Claims (1)

[Claims] 1. A reversal lining method using an inner lining material made of a shape memory resin and having a shape changed so as to have a small cross-sectional area, and a heat-resistant film tube into which the resin pipe is inserted. While supplying pressurized water having a pressure equal to or higher than a certain pressure to the pressure / heating container containing the material, the pressurized water is heated at a temperature not lower than the shape recovery temperature of the resin pipe and not higher than the shape memory temperature to soften the lining material, While supplying the heated pressurized fluid to the heat retaining hose attached to the lining material supply port of the pressurizing / heating container, pass the lining material through the heat retaining hose, and the heat resistant film tube of the lining material is attached to the fixing part provided at the tip of the heat retaining hose. The lining material is inverted and fixed so that it is on the inside, and the heated pressurized fluid is continuously supplied to the pressurizing / heating container to advance the inverting portion of the lining material into the existing pipe. Inverted lining method which is characterized the door.